Re: Acceptable HIT/MISS ratios

From: Tom Minchin <>
Date: Thu, 21 Aug 1997 14:45:06 +1000 (EST)

> Hi,
> I was curious to know what most people thought was an acceptable HIT/MISS
> ratio for the average cache. My server has around 27% HIT/70% MISS.
> Is this what I can expect from general Internet users plus some smaller
> ISP's hanging off our backbone?
> Also, my figures for external fetches are quite disturbing: 87% DIRECT the
> rest to my parent. If this sort of thing is normal could someone please
> correct me? It would seem to me that the parent should have these sort of
> fetches rather than a 'child' cache.
That's just the request ratio. You need to measure total bytes and bytes
saved to get something more meaningful.

If you have child caches, force them to go via your central parent cache.
Don't expect to get much in the way of sibling ICP hits.
Received on Wed Aug 20 1997 - 21:48:37 MDT

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